One possible explanation is to think about "the billionaires" as a contested group with inconsistent membership, not a unified group that endures over time. Perhaps Democrats emphasize competition (new billionaires under Clinton, Obama), while Republicans protect incumbents (fewer new billionaires). If so, then status quo billionaires should favor Republicans, while innovators should favor Democrats.
One possible explanation is to think about "the billionaires" as a contested group with inconsistent membership, not a unified group that endures over time. Perhaps Democrats emphasize competition (new billionaires under Clinton, Obama), while Republicans protect incumbents (fewer new billionaires). If so, then status quo billionaires should favor Republicans, while innovators should favor Democrats.
Can you share more of your statistical analysis?